Fix PA buglet with sprintf formatting

[Jeff Law]

If we have enough thunks we could potentially overwrite the output 
buffer in pa_asm_output_mi_thunk:

      ASM_GENERATE_INTERNAL_LABEL (label, "LTHN", current_thunk_number);

In reality we're unlikely to get enough thunks to cause a problem, but 
fixing this is easy by just increasing the size of the buffer.

Installed on the trunk.

Jeff
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index c9b72bc..7d869b1 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,8 @@
 2016-10-26  Jeff Law  <l...@redhat.com>
 
+       * config/pa/pa.c (pa_asm_output_mi_thunk): Increase buffer
+       size.
+
        * config/h8300/h8300.c (h8300_print_operand): Adjust FALLTHRU
        comment to silence warning.
 
diff --git a/gcc/config/pa/pa.c b/gcc/config/pa/pa.c
index e04abd4..c8ce083 100644
--- a/gcc/config/pa/pa.c
+++ b/gcc/config/pa/pa.c
@@ -8345,7 +8345,7 @@ pa_asm_output_mi_thunk (FILE *file, tree thunk_fndecl, 
HOST_WIDE_INT delta,
   static unsigned int current_thunk_number;
   int val_14 = VAL_14_BITS_P (delta);
   unsigned int old_last_address = last_address, nbytes = 0;
-  char label[16];
+  char label[17];
   rtx xoperands[4];
 
   xoperands[0] = XEXP (DECL_RTL (function), 0);